eng_init.c

/* crypto/engine/eng_init.c *//* ==================================================================== * Copyright (c) 1999-2001 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */#include "eng_int.h"/* Initialise a engine type for use (or up its functional reference count * if it's already in use). This version is only used internally. */int engine_unlocked_init(ENGINE *e)
{
int to_return = 1;
if((e->funct_ref == 0) && e->init)
/* This is the first functional reference and the engine * requires initialisation so we do it now. */
to_return = e->init(e);
if(to_return)
{
/* OK, we return a functional reference which is also a * structural reference. */
e->struct_ref++;
e->funct_ref++;
engine_ref_debug(e, 0, 1)
engine_ref_debug(e, 1, 1)
}
return to_return;
}
/* Free a functional reference to a engine type. This version is only used * internally. */int engine_unlocked_finish(ENGINE *e, int unlock_for_handlers)
{
int to_return = 1;
/* Reduce the functional reference count here so if it's the terminating * case, we can release the lock safely and call the finish() handler * without risk of a race. We get a race if we leave the count until * after and something else is calling "finish" at the same time - * there's a chance that both threads will together take the count from * 2 to 0 without either calling finish(). */
e->funct_ref--;
engine_ref_debug(e, 1, -1);
if((e->funct_ref == 0) && e->finish)
{
if(unlock_for_handlers)
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
to_return = e->finish(e);
if(unlock_for_handlers)
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
if(!to_return)
return 0;
}
#ifdef REF_CHECKif(e->funct_ref < 0)
{
fprintf(stderr,"ENGINE_finish, bad functional reference count\n");
abort();
}
#endif/* Release the structural reference too */if(!engine_free_util(e, 0))
{
ENGINEerr(ENGINE_F_ENGINE_UNLOCKED_FINISH,ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}
/* The API (locked) version of "init" */int ENGINE_init(ENGINE *e)
{
int ret;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_INIT,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
ret = engine_unlocked_init(e);
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
return ret;
}
/* The API (locked) version of "finish" */int ENGINE_finish(ENGINE *e)
{
int to_return = 1;
if(e == NULL)
{
ENGINEerr(ENGINE_F_ENGINE_FINISH,ERR_R_PASSED_NULL_PARAMETER);
return 0;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
to_return = engine_unlocked_finish(e, 1);
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
if(!to_return)
{
ENGINEerr(ENGINE_F_ENGINE_FINISH,ENGINE_R_FINISH_FAILED);
return 0;
}
return to_return;
}